still need to PAY for staff to maintain claims and billing for patients who are not in the Public Option.
Also, since the Public Option pool will attract those with the worst health, the costs of providing their care will be worse than the costs of providing care to those in the "private option" pool, because the costs of care are going to be higher in the Public Option pool it will not be economically viable and will collapse of its own accord, at which time a whole chorus of Insurance Co Lobbyists will be sure that America hears a hearty "I told you so."
Public Option currently under discussion has all kinds of restrictions on how it works in order to keep it from competing tooo much with Private insurance, stuff such as the doctors cannot charge less and so forth. It's a dodge, a bone being thrown to the dogs, in order to protect one of the MAJOR sources of campaign funds, the Insurance Co Lobby. Ron Reagan Jr. has been talking about this stuff for a few weeks now on Air America Radio
http://airamerica.com/ - last week especially - he also talked to Jonathan Alter about the problems with how Congress is working on this: things like why Reconciliation will NOT actually work to deliver a functional health care reform bill and something called The Byrd Ammendment.
I am for Single Payer, because I am around Health Care Providers quite a bit, many are strongly in support of and members of Physicians for a National Health Program
http://www.pnhp.org/ - which is dedicated to Single Payer Health Care.